Bug#793685: `yesod devel` fails without non-lo IPv4 address

[Christoph Egger]

Package: yesod
Version: 1.4.11-1
Severity: normal

Hi!

  Running `yesod devel` on a IPv6-only system (only the loopback device
has a IPv4 address) fails. It stays in the state of "applications hasn't
finished building"). As soon as I add some (even some invalid) IPv4 address
to the outer interface it instantly works (and keeps working)

  Christoph

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.0.0-2-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages yesod depends on:
ii  libc6        2.19-19
ii  libffi6      3.2.1-3
ii  libgmp10     2:6.0.0+dfsg-7
ii  libyaml-0-2  0.1.6-3
ii  zlib1g       1:1.2.8.dfsg-2+b1

Versions of packages yesod recommends:
ii  ghc                                7.8.4-9
ii  libghc-aeson-dev                   0.8.0.2-2+b4
ii  libghc-classy-prelude-conduit-dev  0.11.1-1+b1
ii  libghc-classy-prelude-dev          0.11.1.1-1+b1
ii  libghc-classy-prelude-yesod-dev    0.11.1-1
ii  libghc-conduit-dev                 1.2.4.2-1+b1
ii  libghc-data-default-dev            0.5.3-3+b3
ii  libghc-fast-logger-dev             2.3.1-2+b4
ii  libghc-file-embed-dev              0.0.8.2-2+b3
ii  libghc-hjsmin-dev                  0.1.4.7-5+b4
ii  libghc-hspec-dev                   2.1.7-2
ii  libghc-http-conduit-dev            2.1.5-1+b1
ii  libghc-monad-control-dev           1.0.0.4-1
ii  libghc-monad-logger-dev            0.3.13.1-3+b6
ii  libghc-persistent-dev              2.1.6-1+b2
ii  libghc-persistent-sqlite-dev       2.1.4.2-1+b1
ii  libghc-persistent-template-dev     2.1.3.4-1+b1
ii  libghc-resourcet-dev               1.1.5-1+b1
ii  libghc-safe-dev                    0.3.9-1
ii  libghc-shakespeare-dev             2.0.5-1+b1
ii  libghc-text-dev                    1.2.0.6-1
ii  libghc-unordered-containers-dev    0.2.5.1-2+b4
ii  libghc-vector-dev                  0.10.12.3-2+b4
ii  libghc-wai-extra-dev               3.0.7.1-1+b1
ii  libghc-wai-logger-dev              2.2.4.1-1+b1
ii  libghc-warp-dev                    3.0.13.1-1+b1
ii  libghc-yaml-dev                    0.8.11-1+b1
ii  libghc-yesod-auth-dev              1.4.5.1-1+b1
ii  libghc-yesod-core-dev              1.4.11-2
ii  libghc-yesod-dev                   1.4.1.5-1+b1
ii  libghc-yesod-form-dev              1.4.4.1-3+b6
ii  libghc-yesod-static-dev            1.4.0.4-1+b6
ii  libghc-yesod-test-dev              1.4.3.1-3+b6

yesod suggests no packages.

-- no debconf information